I found this – 2.1c has a demand curve so you could derive the graph. http://www.nd.edu/~tgresik/Econ30010/Homework1Answers.pdf

seeing as how your probably a university student I’m not going to grant you the answers…if you’re totally lost, check wikipedia – they have an awesome econ section…or your textbook. Don’t be afraid to test different values for your variables, this way you can see how it affects the demand curve. For maximizing profit – do you remember anything about the marginal revenue equaling the marginal cost – check your notes!

Price: p

a) Revenue = Quantity x Price = ( -20p+5000 )p =

-20p^2+ 5000p

b) -20(20^2) +5000(20) = 92000

d) dR/dx = -40p + 5000 = 0; p = 125.

Quantity = -20(125)+5000 = 2500

R = -20(125^2) +5000(125) = 312500

e) p =125

you must be smart to be doing that kind of math…